WO2014002227A1 - Procédé de production de batterie et batterie - Google Patents

Procédé de production de batterie et batterie Download PDF

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Publication number
WO2014002227A1
WO2014002227A1 PCT/JP2012/066564 JP2012066564W WO2014002227A1 WO 2014002227 A1 WO2014002227 A1 WO 2014002227A1 JP 2012066564 W JP2012066564 W JP 2012066564W WO 2014002227 A1 WO2014002227 A1 WO 2014002227A1
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WIPO (PCT)
Prior art keywords
foil
battery
positive electrode
welded
low
Prior art date
Application number
PCT/JP2012/066564
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English (en)
Japanese (ja)
Inventor
井上　俊彦
宮久　正春
小西　始
鳥山　幸一
Original Assignee
トヨタ自動車株式会社
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by トヨタ自動車株式会社 filed Critical トヨタ自動車株式会社
Priority to JP2014522305A priority Critical patent/JP5884908B2/ja
Priority to US14/410,645 priority patent/US9819027B2/en
Priority to DE201211006588 priority patent/DE112012006588T5/de
Priority to PCT/JP2012/066564 priority patent/WO2014002227A1/fr
Priority to KR1020147036085A priority patent/KR101746913B1/ko
Priority to CN201280074329.1A priority patent/CN104396050B/zh
Publication of WO2014002227A1 publication Critical patent/WO2014002227A1/fr

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    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
    • H01M50/50—Current conducting connections for cells or batteries
    • H01M50/531—Electrode connections inside a battery casing
    • H01M50/538—Connection of several leads or tabs of wound or folded electrode stacks
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M10/00—Secondary cells; Manufacture thereof
    • H01M10/04—Construction or manufacture in general
    • H01M10/0413—Large-sized flat cells or batteries for motive or stationary systems with plate-like electrodes
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M10/00—Secondary cells; Manufacture thereof
    • H01M10/04—Construction or manufacture in general
    • H01M10/0431—Cells with wound or folded electrodes
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M10/00—Secondary cells; Manufacture thereof
    • H01M10/42—Methods or arrangements for servicing or maintenance of secondary cells or secondary half-cells
    • H01M10/4235—Safety or regulating additives or arrangements in electrodes, separators or electrolyte
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M4/00—Electrodes
    • H01M4/02—Electrodes composed of, or comprising, active material
    • H01M4/04—Processes of manufacture in general
    • H01M4/0471—Processes of manufacture in general involving thermal treatment, e.g. firing, sintering, backing particulate active material, thermal decomposition, pyrolysis
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M4/00—Electrodes
    • H01M4/02—Electrodes composed of, or comprising, active material
    • H01M4/64—Carriers or collectors
    • H01M4/66—Selection of materials
    • H01M4/661—Metal or alloys, e.g. alloy coatings
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M4/00—Electrodes
    • H01M4/02—Electrodes composed of, or comprising, active material
    • H01M4/64—Carriers or collectors
    • H01M4/70—Carriers or collectors characterised by shape or form
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
    • H01M50/50—Current conducting connections for cells or batteries
    • H01M50/531—Electrode connections inside a battery casing
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
    • H01M50/50—Current conducting connections for cells or batteries
    • H01M50/531—Electrode connections inside a battery casing
    • H01M50/536—Electrode connections inside a battery casing characterised by the method of fixing the leads to the electrodes, e.g. by welding
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
    • H01M50/50—Current conducting connections for cells or batteries
    • H01M50/572—Means for preventing undesired use or discharge
    • H01M50/574—Devices or arrangements for the interruption of current
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
    • H01M50/50—Current conducting connections for cells or batteries
    • H01M50/572—Means for preventing undesired use or discharge
    • H01M50/574—Devices or arrangements for the interruption of current
    • H01M50/578—Devices or arrangements for the interruption of current in response to pressure
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
    • B23K11/00—Resistance welding; Severing by resistance heating
    • B23K11/10—Spot welding; Stitch welding
    • B23K11/11—Spot welding
    • B23K11/115—Spot welding by means of two electrodes placed opposite one another on both sides of the welded parts
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
    • B23K20/00—Non-electric welding by applying impact or other pressure, with or without the application of heat, e.g. cladding or plating
    • B23K20/10—Non-electric welding by applying impact or other pressure, with or without the application of heat, e.g. cladding or plating making use of vibrations, e.g. ultrasonic welding
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M2200/00—Safety devices for primary or secondary batteries
    • H01M2200/20—Pressure-sensitive devices
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
    • Y02E60/10—Energy storage using batteries
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
    • Y02P70/00—Climate change mitigation technologies in the production process for final industrial or consumer products
    • Y02P70/50—Manufacturing or production processes characterised by the final manufactured product
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T29/00—Metal working
    • Y10T29/49—Method of mechanical manufacture
    • Y10T29/49002—Electrical device making
    • Y10T29/49108—Electric battery cell making

Definitions

  • the present invention is a battery comprising an electrode body having a foil multilayer portion in which a foil exposed portion of an aluminum foil overlaps in a thickness direction of the positive electrode plate, a positive electrode terminal member made of aluminum and resistance-welded to the foil multilayer portion, and
  • the present invention relates to a method for manufacturing such a battery.
  • Patent Document 1 discloses a joining method in which a laminated aluminum foil is resistance-welded to a base plate made of aluminum. Specifically, this joining method includes an ultrasonic tempering step for forming a temporary attachment portion in which a plurality of laminated aluminum foils are temporarily attached by ultrasonic welding, and the temporary attachment portion and the base plate with two electrodes. And a resistance welding step of energizing these electrodes and resistance welding the temporary attachment portion and the base plate.
  • a nugget a region formed by melting, mixing and solidifying a part of two metal members
  • a high resistance oxide film (alumina film) is present on each surface of the temporary attachment part (foil multilayer part) and the base plate (positive electrode terminal member) used in the joining method described in Patent Document 1 described above. . Therefore, in order to weld by applying an electric current to a temporary attachment part and a base board, it is necessary to destroy a part of oxide film of each surface, and it is necessary to apply a high voltage between the electrodes for resistance welding.
  • the present invention provides a battery that secures good welding strength between the foil layered portion of the electrode body and the positive electrode terminal member by resistance welding, and a method for manufacturing such a battery. With the goal.
  • One aspect of the present invention includes a positive electrode plate having an aluminum foil, and of the positive electrode plate, an electrode body having a foil multilayer portion in which a foil exposed portion where the aluminum foil is exposed overlaps in the thickness direction, and aluminum, A positive electrode terminal member resistance-welded to the foil multi-layer part, and the foil multi-layer part and the positive electrode terminal member are coupled to each other through a plurality of nuggets distributed in the form of dots in the spreading direction of the aluminum foil.
  • a method for manufacturing a battery comprising: a foil welded portion obtained by welding aluminum foils that are overlapped with each other in the thickness direction by ultrasonic welding in the foil multilayer portion, wherein one side in the thickness direction of the surface thereof A plurality of first high-level portions that are higher on one side in the thickness direction and lower than the first high-level portions and distributed in the form of scattered dots in the first high-level portions, on at least a part of the planned bonding surface
  • a resistance welding step of resistance-welding the foil welded part of the electrode body and the positive electrode terminal member via a battery.
  • the first high-order part of the foil welded part is brought into contact with the positive electrode terminal member to pass a current, and a nugget is generated in the first low-order part.
  • the following can be considered as a reason why the nugget is generated in the first low-order part. That is, in the first high-order part of the foil welded part, the aluminum foils are not pressed strongly in the height direction (thickness direction of the aluminum foil) and do not overlap closely as the first low-order part. For this reason, during resistance welding, the current inside the first high level portion is relatively difficult to flow in the height direction (thickness direction), so the current flowing through the first high level portion has a height inside the first high level portion. Rather than proceeding in the direction, the aluminum proceeds between the first high level part and the first low level part, and proceeds to the first low level part through an aluminum foil having a side surface or a slope, and proceeds in the height direction at the first low level part. (Or proceed in the reverse direction). Therefore, during resistance welding, current flows in a concentrated manner on the side surface or slope around the first low-order part, and this part and the first low-order part melt.
  • the resistance welding process welding is performed by bringing the first high-order portion into contact with the positive electrode terminal member. For this reason, the first high-order part is pressed in the height direction, and the aluminum foil forming the first high-order part is thinned, while the corresponding meat (aluminum) spreads around the first high-order part. Extruded. Then, the extruded aluminum is melted on the side surface or the slope between the first high-order part and the first low-order part described above to generate nuggets.
  • the nugget generated between the foil welded portion and the positive electrode terminal member bonds the foil multilayer portion and the positive electrode terminal member at multiple points. For this reason, there is a low possibility that molten aluminum is ejected from the nugget, and even if it is ejected, it remains in a small amount. Thus, it is possible to manufacture a battery that ensures good welding strength between the foil layered portion and the positive electrode terminal member while being resistance welding.
  • the process of providing a 1st high level part or a 1st low level part in a joining plan surface by a press is mentioned.
  • the process of providing a 1st high-order part and a 1st low-order part in the joining plan surface at the same time it makes the horn or anvil used for ultrasonic welding uneven
  • examples of the first low-order portion include a conical recess, a polygonal pyramid-shaped recess such as a pyramid (square pyramid), and a truncated cone-shaped recess such as a quadrangular pyramid.
  • a form which distributed the some 1st low level part in the 1st high level part in the shape of a dot the form which has arrange
  • the forming step is performed on at least a part of a surface of the foil welded portion on the electrode side surface that is located on the other side in the thickness direction and contacts the resistance welding electrode.
  • the foil welded portion is formed, and the resistance welding step is preferably a battery manufacturing method in which the second high-order portion is crushed in the thickness direction with the resistance welding electrode.
  • examples of the second low-order part include a conical recess, a polygonal pyramid-shaped recess such as a pyramid (a quadrangular pyramid), and a frustum-shaped recess such as a quadrangular pyramid.
  • examples of the form in which the plurality of second low-order parts are distributed in a dotted pattern in the second high-order part include a form in which the second low-order parts are arranged in a grid pattern and a form in which they are arranged in a radial pattern.
  • first low-order parts are arranged in a lattice pattern in the first high-order part
  • second low-order parts are arranged in a lattice form in the second high-order part, and the pitch between the second low-order parts. It is preferable that (second pitch P2 described below) be smaller than the pitch (first pitch P1 described below) between the first low-order parts (P2 ⁇ P1).
  • the plurality of first low-order parts are arranged in a lattice pattern in the first high-order part, and the plurality of second low-order parts are lattice-shaped in the second high-order part.
  • the second pitch P2 between the second low-order parts is preferably smaller than the first pitch P1 between the first low-order parts (P2 ⁇ P1). .
  • M / T is 0.00.
  • a battery manufacturing method in the range of 20 to 0.80 is preferable.
  • the battery is a sealed battery in which the electrode body is sealed in a battery case, and the positive terminal member is formed by an increase in internal pressure of the battery case.
  • a battery manufacturing method having a pressure-type current-carrying-off mechanism that cuts off power to the electrode body is preferable.
  • another aspect of the present invention includes a positive electrode plate having an aluminum foil, and of the positive electrode plate, an electrode body having a foil multilayer portion in which a foil exposed portion where the aluminum foil is exposed overlaps in the thickness direction, and aluminum
  • a positive electrode terminal member resistance-welded to the foil multi-layered portion, and the foil multi-layered portion and the positive electrode terminal member include a plurality of nuggets distributed in the form of dots in the spreading direction of the aluminum foil. It is a battery formed by coupling via.
  • the foil multilayer portion includes a foil welded portion in which the aluminum foils are welded to each other in the thickness direction by ultrasonic welding, and at least a part of the foil welded portion is the positive electrode.
  • a battery formed by resistance welding to the terminal member via the plurality of nuggets is preferable.
  • M / T is in the range of 0.20 to 0.80. It is better to use the battery.
  • any one of the above-described batteries wherein the electrode body is sealed in a battery case, and the positive electrode terminal member is energized to the electrode body due to an increase in internal pressure of the battery case. It is preferable that the battery has a pressure-type energization cutoff mechanism that shuts off the battery.
  • FIG. 1 is a perspective view of a battery according to an embodiment (Examples 1 to 6).
  • FIG. 1 is a plan view of a battery according to an embodiment (Example 1 to Example 6).
  • FIG. FIG. 6 is an explanatory diagram (partially enlarged view of part E in FIG. 2) of the battery according to the embodiment (Examples 1 to 6).
  • FIG. 4 is a cross-sectional view (cross-section BB in FIG. 2) of the battery according to the embodiment (Examples 1 to 6).
  • FIG. 6 is a partial enlarged cross-sectional view (part C of FIG. 4) of the battery according to the embodiment (Examples 1 to 6).
  • FIG. 6 is a perspective view of a positive electrode plate according to an embodiment (Examples 1 to 6).
  • FIG. 6 is a perspective view of a foil welded part of a battery according to an embodiment (Examples 1 to 6).
  • FIG. 6 is a perspective view of a foil welded part of a battery according to an embodiment (Examples 1 to 6). It is explanatory drawing of a formation process among the manufacturing methods of the battery concerning embodiment (Example 1-Example 6).
  • the battery 1 includes a flat wound electrode body 10, a positive electrode terminal structure 60 that is resistance-welded to a positive electrode plate 20 (described later) that forms the electrode body 10, and a battery case 80 that houses the electrode body 10. This is a sealed lithium ion secondary battery (see FIGS. 1 and 2).
  • the battery 1 includes a negative electrode terminal structure 70 joined (resistance welded) to a negative electrode plate 30 (described later) forming the electrode body 10.
  • the positive electrode terminal structure 60 of the battery 1 has an energization interruption mechanism 62 (described later) that interrupts energization of the electrode body 10 due to an increase in internal pressure of the battery case 80 (see FIGS. 1 and 2).
  • the battery case 80 constituting the battery 1 has a battery case body 81 and a sealing lid 82 both made of aluminum.
  • the battery case main body 81 is a bottomed rectangular box shape, and between this battery case main body 81 and the electrode body 10, the insulating film (not shown) which consists of resin and was bent in the box shape is interposed.
  • the sealing lid 82 has a rectangular plate shape, closes the opening of the battery case body 81, and is welded to the battery case body 81.
  • the negative electrode terminal structure 70 is made of copper, and is mainly composed of a negative electrode internal terminal member 71 located inside the battery case 80, a negative electrode external terminal member 78 also made of copper and located outside the battery case 80, and insulation. It consists of a gasket 79 of a conductive resin (see FIGS. 1 and 2). Among these, the gasket 79 is interposed between the negative electrode external terminal member 78 and the negative electrode internal terminal member 71 and the battery case 80 to insulate them. In addition, the negative electrode internal terminal member 71 is joined to a negative electrode lead portion 38 f (described later) of the negative electrode plate 30 in the battery case 80, while penetrating the sealing lid 82 of the battery case 80 to be connected to the negative electrode external terminal member 78. And continuity.
  • the positive electrode terminal structure 60 is mainly composed of a positive electrode internal terminal structure 61 positioned inside the battery case 80, a positive electrode external terminal member 68 made of aluminum and positioned outside the battery case 80, and an insulating resin gasket 69. (See FIGS. 1 and 2). Among these, the gasket 69 is interposed between the positive electrode external terminal member 68 and the positive electrode internal terminal structure 61 and the battery case 80 and insulates them, like the negative electrode terminal structure 70.
  • the positive electrode internal terminal structure 61 is a known member positioned between a bonding member 63 bonded to a positive electrode foil welded portion 12 (described later) of the electrode body 10 by resistance welding and the bonding member 63 and the positive electrode external terminal member 68.
  • an energization cutoff mechanism 62 is configured to cut off the current flowing between the positive electrode internal terminal structure 61 and the positive electrode external terminal member 68 when the internal pressure of the battery case 80 rises to be equal to or higher than the operating pressure. .
  • the joining member 63 is a flat plate-like main body portion 63 ⁇ / b> X that is electrically connected to the energization cutoff mechanism 62, and extends from the main body portion 63 ⁇ / b> X to the electrode body 10 side. It consists of two rectangular strip-shaped joints 63Y, 63Y. The two joint portions 63Y and 63Y are respectively located on both outer sides in the minor axis direction (left and right direction in FIG. 4) of the electrode body 10 having a flat shape, and are joined to the positive electrode foil weld portion 12 (described later). .
  • the electrode body 10 is formed by winding a belt-like positive electrode plate 20 and a negative electrode plate 30 into a flat shape via a belt-like separator (not shown) made of polyethylene (see FIG. 1).
  • the electrode body 10 is impregnated with an electrolytic solution (not shown) which is an organic solution to which LiPF 6 is added.
  • This electrolyte solution is a gas generating agent that generates a gas by causing an oxidative decomposition reaction and a polymerization reaction when the potential of the positive electrode plate 20 becomes equal to or higher than its own reaction potential (in this example 1, the reaction potential is 4. 5V vs. Li / Li + biphenyl).
  • the negative electrode plate 30 constituting the electrode body 10 is formed by carrying a negative electrode active material layer (not shown) on both sides of a strip-like negative electrode foil (not shown), leaving a negative electrode lead portion 38f along one side.
  • the positive electrode plate 20 includes a positive electrode foil 28 made of aluminum in a strip shape extending in the longitudinal direction DA and a short direction DB DB of the positive electrode foil 28 (both main surfaces of the positive electrode foil 28). It has two strip-shaped positive electrode active material layers 21, 21 that are formed to be biased to the side (upper left side in FIG. 6) and extend in the longitudinal direction DA of the positive electrode foil 28.
  • the positive electrode plate 20 has a positive electrode lead portion 28f where the positive electrode foil 28 is exposed from the positive electrode active material layer 21 on the other side (lower right side in FIG. 6) of the positive electrode foil 28 in the short direction DB.
  • the positive electrode lead portion 28 f of the positive electrode plate 20 overlaps the thickness direction DT of the positive electrode foil 28 on one side (right side in FIG. 2) of the electrode body 10 in the axial direction DX.
  • the positive electrode foil multilayer portion 11 having a substantially oval cross section.
  • this positive foil layered portion 11 includes a positive foil weld portion 12 in which the positive foils 28 of the positive electrode lead portion 28f are welded to each other in the thickness direction DT by ultrasonic welding in a parallel portion of an ellipse (FIGS. 2 to 4). reference).
  • the positive electrode foil welded portion 12 of the positive foil multilayer portion 11 and the above-described joining member 63 (joint portion 63Y) of the positive electrode terminal structure 60 are resistant. Welded. And as shown in FIG. 3 (partial enlarged view of the E part of FIG. 2) and sectional drawing of FIG. 5 (partial enlarged sectional view of the C part of FIG. 4), the positive electrode foil welding part 12 and the joining member 63 ( A nugget N formed by melting them during resistance welding is formed between the joint 63Y).
  • the nuggets N are arranged in the form of dots (lattice) in the spreading direction of the positive foil 28 (the direction parallel to the paper surface in FIG. 3). Further, in this battery 1, the maximum dimension M in the thickness direction DT (left and right direction in FIG. 5) of the nugget N is 0.30 mm, and the thickness dimension T of the positive electrode foil welded portion 12 is 0.60 mm (see FIG. 5). ).
  • the positive electrode foil welded portion 12 of the positive electrode foil multilayer portion 11 and the joint portions 63Y of the positive electrode terminal structure 60 are arranged in a plurality of dots (lattice shape). They are connected via nuggets N and N (see FIG. 3). For this reason, it can be set as the battery 1 which ensured favorable welding strength between the positive electrode foil multilayered part 11 and the positive electrode terminal structure 60.
  • FIG. 1 illustrates the battery 1 which ensured favorable welding strength between the positive electrode foil multilayered part 11 and the positive electrode terminal structure 60.
  • the positive electrode terminal structure 60 and the positive electrode foil welded portion 12 are resistance welded via a nugget N formed at the time of resistance welding described later. Moreover, in the positive electrode foil welded portion 12, since the positive electrode foils 28 of the positive electrode lead portion 28f are welded to each other in the thickness direction DT by ultrasonic welding, each positive electrode foil 28 and the positive electrode terminal structure 60 are electrically connected with low resistance. The battery 1 can be obtained.
  • the positive electrode foil multilayer part 11 and the positive electrode terminal structure 60 are resistance-welded, in the energization cutoff mechanism 62 included in the positive electrode terminal structure 60, the positive electrode foil multilayer part 11 and the positive electrode terminal structure 60 are ultrasonicated. There is no problem that occurs when welding (for example, occurrence of a shift in operating pressure). Therefore, the battery 1 can be reliably cut off from energization to the electrode body 10 due to an increase in the internal pressure of the battery case 80.
  • a method for manufacturing the battery 1 according to this embodiment (Example 1) will be described with reference to FIG.
  • a belt-like separator is interposed between the belt-like positive electrode plate 20 and the negative electrode plate 30 each produced by a known method, and these are wound around the winding axis AX.
  • the positive electrode lead portion 28f of the positive electrode plate 20 is on one side in the axial direction DX of the winding axis AX (left side in FIG. 7), and the negative electrode lead portion 38f of the negative electrode plate 30 is on the other side in the axial direction DX (FIG. 7).
  • the electrode body 10 After winding, the electrode body 10 was deformed into a flat shape to form a flat wound electrode body 10 (see FIG. 7).
  • This electrode body 10 has a positive electrode foil multilayer portion 11 on which the positive electrode lead portion 28f of the positive electrode foil 28 overlaps on the other side in the axial direction DX (left side in FIG. 7).
  • the first block body 110 and the second block body 120 made of steel are used.
  • the 1st block body 110 is a substantially rectangular plate shape, and the front-end
  • the 2nd block body 120 has the front end surface 121 of the state by which the one part of the thickness direction was notched by the substantially rectangular plate shape.
  • the first block body 110 is inserted into the center of the positive electrode foil multilayer portion 11 of the electrode body 10. Specifically, as shown in FIG. 7, the first block body 110 having the triangular columnar tip 112 arranged on the electrode body 10 side is moved from the left side to the right side in FIG. 7 along the winding axis AX. Let And the positive electrode foil multilayer part 11 is divided into two by the 1st block body 110 (refer FIG. 8). At the same time, the second block body 120 is pressed against the parallel part of the ellipse in the positive electrode foil multilayer portion 11 from the outside. Specifically, as shown in FIG.
  • the second block body 120 in which the above-described front end surface 121 is arranged toward the parallel part of the ellipse in the positive electrode foil multi-layer part 11 is arranged in the minor axis direction DS (in FIG. 7).
  • the positive electrode lead portion 28f (left side in FIG. 8) of the positive electrode foil 28 is connected to the front end surface 121 of the second block body 120 and the first portion in the oblong parallel portion of the positive electrode foil multilayer portion 11.
  • the positive electrode foil proximity portion 12B is formed between the side surfaces 111 of the block body 110 and attached in a state of being close to the thickness direction DT (see FIG. 8).
  • the positive electrode foil 28 (positive electrode lead portion 28f) overlapping in the thickness direction DT at the positive electrode foil proximity portion 12B is ultrasonically welded.
  • an ultrasonic welding apparatus 130 that vibrates the horn machining surface 132 of the horn 131 in parallel with the anvil machining surface 137 of the anvil 136 that faces the horn machining surface 132 is used.
  • a plurality of first convex portions 133 that are convex in a quadrangular pyramid shape are arranged in a lattice shape (specifically, 2 rows ⁇ 6 rows) on the horn processed surface 132 that is the tip surface of the horn 131.
  • the pitch between the 1st convex parts 133 and 133 in this horn process surface 132 is 0.50 mm.
  • a plurality of second convex portions 138 convex in a quadrangular pyramid shape are arranged in a lattice shape (specifically, 5 rows ⁇ 20 rows).
  • the pitch between the 2nd convex parts 138 and 138 in this anvil processed surface 137 is 0.10 mm.
  • the horn 131 and the anvil 136 of the ultrasonic welding apparatus 130 press the positive foil proximity portion 12B in the thickness direction DT and apply ultrasonic vibration from the horn 131 to remove the positive foil 28 of the positive foil proximity portion 12B. Ultrasonic welding. As a result, the foil-welded portion 12 ⁇ / b> C in which the cathode foils 28 are welded to each other in the thickness direction DT and integrated with each other on the cathode foil multilayer portion 11 is formed.
  • the foil welded portion 12C has a short-diameter outer side DS1 on the first foil-welded surface 13 facing the outer side DS1 (upper side in FIG. 10) of its own surface.
  • the first high-order part 13D which is higher than the first high-order part 13D
  • the first low-order part 13E which is lower than the first high-order part 13D
  • the bottom of the quadrangular pyramid-shaped recess formed by the first convex portion 133 of the horn 131 described above is the first low-order portion 13E
  • the portion between the recesses is the first high-order portion 13D. (See FIG. 10).
  • the first high level portion 13 ⁇ / b> D is located on the same plane as the first foil welding surface 13.
  • the first low-order parts 13E are distributed in a lattice shape (specifically, 2 rows ⁇ 6 rows) at a pitch of 0.50 mm (first pitch P1) in the first high-order part 13D ( (See FIG. 10).
  • the second foil weld surface 14 facing the inner side DS2 (upper side in FIG. 11) faces the second inner side DS2 higher than the inner surface DS2.
  • the second high-order part 14D and the second low-order part 14E which is lower than the second high-order part 14D are formed.
  • the bottom of the quadrangular pyramid-shaped depression formed by the second convex part 138 of the anvil 136 described above is the second low-order part 14E, and the part between the depressions is the second high-order part 14D. (See FIG. 11).
  • the second high-order part 14 ⁇ / b> D is located on the same plane as the second foil welding surface 14. Further, the second low-order parts 14E are distributed in the second high-order part 14D side by side in a lattice shape (specifically, 5 rows ⁇ 20 rows) at a pitch of 0.10 mm (second pitch P2) ( FIG. 11).
  • a foil welded portion 12C is similarly produced on the opposite side of the oval parallel portion of the positive electrode foil multilayer portion 11.
  • the electrode body 10 in which the foil welded portion 12C is formed in each of the parallel portions of the ellipse of the positive foil layered portion 11 divided into two is completed (see FIG. 12).
  • a known resistance welding apparatus 140 having a first electrode 141 and a second electrode 146 made of copper is used.
  • the first electrode surface 142 of the first electrode 141 and the second electrode surface 147 forming the tip surface of the second electrode 146 are coaxially opposed to each other (see FIG. 13).
  • the first electrode surface 142 and the second electrode surface 147 are both circular in outer periphery and bulge out in a spherical shell shape.
  • the joint portion 63Y of the joint member 63 of the positive electrode terminal structure 60 is brought into contact with the foil welded portion 12C of the positive electrode foil multilayer portion 11 of the electrode body 10 (see FIGS. 13 and 14).
  • the positive electrode terminal structure 60 having the energization interruption mechanism 62 is assembled to the sealing lid 82 in advance by a known method.
  • one of the two joint portions 63Y and 63Y of the positive electrode terminal structure 60 is brought into contact with one of the first foil weld surfaces 13 of the two foil weld portions 12C and 12C on the electrode body 10 (see FIG. 13). ).
  • the first high-order part 13D of the first foil welded surface 13 is brought into contact with the joint part 63Y.
  • a portion of the joint portion 63Y that is in contact with the first high-order portion 13D is referred to as a contact portion 63YT.
  • the welded portion 63Y of the positive electrode terminal structure 60 and the foil welded portion 12C in contact with the joined portion 63Y are resistance welded.
  • the first electrode 141 is on the second foil welding surface 14 side in the foil welded portion 12C
  • the second electrode 146 is on the joint 63Y side of the positive electrode terminal structure 60, respectively.
  • the first electrode 141 and the second electrode 146 sandwich the foil welded portion 12C and the joining portion 63Y in the thickness direction DT of the positive foil 28.
  • 16 is a cross-sectional view showing a state in which the first electrode 141 and the second electrode 146 sandwich the foil welded portion 12C and the joint portion 63Y. Due to the clamping pressure between the first electrode 141 and the second electrode 146, the first high-order part 13D is in pressure contact with the joint part 63Y (contact part 63YT). In this state, a current was passed between the first electrode 141 and the second electrode 146 to resistance weld the foil welded part 12C and the joining part 63Y.
  • the first high level portion 13D of the foil welded portion 12C is stronger in the height direction (thickness direction DT of the positive foil 28) than the first low level portion 13E. They are not pressed together and do not overlap closely. For this reason, when a current is passed between the first electrode 141 and the second electrode 146, the current flows in the first high level portion 13D relatively in the thickness direction DT, and therefore flows through the first high level portion 13D. The current does not travel in the thickness direction DT inside the first high level portion 13D, but passes through the positive foil 28 that forms the slope 13S located between the first high level portion 13D and the first low level portion 13E.
  • the first high-order part 13D When the first high-order part 13D is pressed against the joint 63Y, the first high-order part 13D is pressed in the thickness direction DT, and the stacked positive foils 28 and 28 forming the first high-order part 13D are thinned. , The meat (aluminum) is spread around the first high-order part 13D and pushed out in the direction (left and right direction in FIG. 16). The extruded aluminum is melted on the slope 13S described above.
  • the second high-order part 14D of the second foil welding surface 14 having a smaller pitch than the first foil welding surface 13 becomes the first electrode of the first electrode 141.
  • the surface 142 is crushed in the thickness direction DT (see FIG. 16).
  • the oxide film covering each second high-order part 14D is destroyed, and aluminum (new surface) is exposed at a plurality of locations on the surface (deformed surface 14C).
  • the contact resistance between the 1st electrode 141 and the 2nd foil welding surface 14 becomes low, and heat_generation
  • the second foil welding surface 14 of the foil welded part 12C is prevented from melting, and the positive electrode foil welded part 12 and the positive terminal structure It is possible to reliably resistance weld the joint portion 63Y of the body 60 (see FIGS. 3 and 5).
  • the other of the joint portions 63Y of the positive electrode terminal structure 60 and the foil welded portion 12C were resistance-welded in the same manner.
  • the electrode body 10 in which the positive electrode terminal structure 60 is bonded to the positive electrode foil multilayer portion 11 (positive electrode foil welded portion 12) can be obtained.
  • the negative electrode terminal structure 70 (negative electrode internal terminal member 71) assembled to the sealing lid 82 by a known technique was joined (resistance welding) to the negative electrode plate 30 (negative electrode lead portion 38f) of the electrode body 10.
  • the electrode body 10 integrated with the sealing lid 82, the positive electrode terminal structure 60 and the negative electrode terminal structure 70 is accommodated in the battery case main body 81, and the battery case main body 81 and the sealing lid 82 are separated from each other by laser welding. Join together.
  • the liquid injection hole is sealed to complete the battery 1 according to Example 1 (see FIG. 1).
  • the welding state of the electrode body 10 and the positive electrode terminal structure 60 of the battery 1 according to Example 1 was investigated. Specifically, the welding strength (tensile strength in the shear direction) between the positive electrode foil multilayer portion 11 (positive foil weld portion 12) of the resistance-welded electrode body 10 and the joint portion 63Y of the positive electrode terminal structure 60 is known. Measured using a tensile tester. The results are shown in Table 1. In Table 1, when the welding strength (tensile strength) is 200 N or more, a “ ⁇ ” mark is shown in the welding state column, when it is 150 N or more and less than 200 N, “ ⁇ ” mark is shown, and when it is less than 150 N, Are marked with an “x”.
  • the thickness direction DT of the nugget N was observed.
  • the maximum dimension M was 0.30 mm.
  • the thickness dimension T of the positive electrode foil welding part 12 was 0.60 mm.
  • the inventors manufactured a plurality of batteries in which the foil welded portions different from the battery 1 only in the first pitch P1 between the first low-order portions were formed in the forming step described above. did. Specifically, in the forming step, using a horn having a horn processed surface with a pitch between the first protrusions of 0.15 mm, the foil welded portion with the first pitch P1 of 0.15 mm is used as the positive electrode foil of the electrode body. It formed in the multilayer part. Then, the resistance welding process was performed similarly to the battery 1 concerning Example 1, and it was set as the battery (battery of Example 2).
  • each battery made using the foil welded portions with the first pitch P1 of 0.22 mm, 0.67 mm, 0.83 mm, and 0.92 mm, respectively (Examples) 3 to 6) were manufactured.
  • the second low-order part, the second pitch P2 between them was 0.10 mm, and the thickness dimension T of the positive foil multilayer part was 0.60 mm (see Table 1).
  • the first high-order part and the first low-order part are formed on the first foil welding surface, and the second high-order part and the second low-order part are not formed on the second foil welding surface, and then a foil weld part is formed.
  • a battery was manufactured by performing a resistance welding process in the same manner as in Example 1 (battery of comparative example).
  • the thickness T of this positive electrode foil multilayer portion is 0.60 mm as in Examples 1 to 6 (see Table 1).
  • the welding strength (tensile strength) between the foil welded portion and the joint portion 63Y and the maximum dimension M in the thickness direction DT of the nugget N were measured in the same manner as the battery 1. . Further, a ratio M / T obtained by dividing the maximum dimension M of the nugget N by the thickness dimension T of the positive electrode foil multilayer portion was calculated. It shows in Table 1 about each measurement result.
  • the maximum dimension M in the thickness direction DT of the nugget N is also increased as the first pitch P1 is increased.
  • the reason for this is considered as follows. That is, since the first low-order part of the first foil welding surface is a bottom part of a truncated pyramid shape, the number of first low-order parts covered by the positive electrode terminal structure 60 (joint part 63Y) increases as the first pitch P1 increases. Less. For this reason, during resistance welding, the current (electric power) concentrated on one first low-order part increases, so that the slope between the first high-order part and the first low-order part and the first low-order part are more A lot of aluminum melts.
  • the welding strength of the batteries of Examples 1 and 3 to 6 was “ ⁇ ” except that the welding strength of the battery of Example 2 was “ ⁇ ”. ⁇ ”.
  • the battery of the comparative example was “x”. From this, when looking at the relationship between the ratio M / T and the welding strength, when the ratio M / T is 0.20 or more, the tensile strength becomes 200 N or more and the welding strength can be sufficiently secured, whereas the ratio M / T It can be seen that the weld strength of the battery of Example 2 in which is less than 0.20 (specifically 0.17) is slightly inferior. From this, it can be seen that it is preferable that the first pitch P1 of the first low-order part is 0.20 mm or more.
  • the batteries of Examples 1 to 6 in the batteries of Examples 5 and 6, a nugget N having a large dimension M was formed during resistance welding, and a small amount of aluminum spouted from the nugget N.
  • the values M / T of the batteries of Examples 5 and 6 are 0.83 and 0.92, which are larger than those of the batteries of Examples 1 to 4.
  • the nugget N becomes too large, the remaining thickness of the positive electrode foil welded portion becomes thin, and a part of the molten aluminum forming the nugget N is removed from the nugget N to the outside of the positive electrode foil welded portion. It is thought that it erupted.
  • the welding strengths of the batteries of Examples 5 and 6 were assured as those of the batteries of Examples 2 to 4 (see Table 1). Since a small amount of the melted aluminum forming the nugget N was ejected, it is considered that the welding strength as a whole could be sufficiently secured.
  • the maximum dimension M becomes too large, and much of the molten aluminum in the nugget N is ejected to the outside, and the nugget N part is partially hollow (hole). From these, it can be seen that the ratio M / T is preferably 0.95 or less, and the first pitch P1 is preferably 0.95 mm or less. Furthermore, it can be seen that when the ratio M / T is 0.80 or less (that is, the first pitch P1 is 0.75 mm or less), it is possible to reliably suppress the ejection of molten aluminum during resistance welding.
  • the first foil weld surface and the second foil weld surface remain both planar without forming the first high level portion, the first low level portion, the second high level portion, and the second low level portion.
  • the welding strength between the positive electrode foil welded portion and the joint portion 63Y was measured.
  • both the positive electrode foil welded portion and the contact surface of the joint portion 63Y of the positive electrode terminal structure 60 are flat, so that the current flows concentrated on one portion where the oxide film was first destroyed. Large nuggets N are easily formed. For this reason, when the molten aluminum does not spout from the nugget N, the battery has good welding strength (marked with “ ⁇ ”). On the other hand, when a large amount of aluminum melted from the nugget N is ejected and a part of the nugget N becomes hollow (holes), it is considered that the battery has a low welding strength ("x" mark).
  • the first high-order part 13D of the foil welded part 12C is brought into contact with the positive electrode terminal structure 60 (joint part 63Y) to pass a current, and a plurality of first Nugget N was formed in each lower portion.
  • generated between the positive electrode foil weld part 12 and the positive electrode terminal structure 60 couple
  • the oxide film covering the second high-order part 14D is destroyed and the surface (deformed surface 14C) is destroyed.
  • Aluminum (new surface) is exposed.
  • the battery 1 (and the batteries of Examples 2 to 6) can be easily manufactured by preventing the welding of the 141 and the positive electrode foil welded portion 12.
  • the plurality of first low-order parts 13E and 13E are arranged and formed in a lattice shape in the first high-order part 13D, and the plurality of second low-order parts 14E and 14E are formed as the second high-order part.
  • 14D is arranged in a grid pattern on the inside.
  • the second pitch P2 of the second low-order part 14E is smaller than the first pitch P1.
  • the battery having the positive electrode terminal structure 60 having the energization cutoff mechanism 62 when the positive electrode foil multilayer portion 11 (foil welded portion 12C) of the electrode body 10 and the positive electrode terminal structure 60 are ultrasonically welded, ultrasonic waves are obtained. The vibration is also transmitted to the energization cutoff mechanism 62 of the positive electrode terminal structure 60. Then, when the energizing / blocking mechanism 62 is operated by ultrasonic vibration or a member or the like constituting the energizing / blocking mechanism 62 is deformed, a malfunction occurs such that the operating pressure of the energizing / blocking mechanism 62 deviates from an intended value. There is.
  • the manufacturing method of the battery 1 and the like according to each embodiment since resistance welding is used for welding the positive electrode terminal structure 60 and the foil welded portion 12C of the electrode body 10, the current-carrying-off mechanism of the positive electrode terminal structure 60 is used. No ultrasonic vibration is transmitted to 62. Accordingly, it is possible to manufacture the battery 1 and the like having the energization cutoff mechanism 62 in the positive electrode terminal structure 60 with a high yield.
  • the first low-order part was the bottom of a recess that was recessed into a quadrangular pyramid shape.
  • a recess recessed in a conical shape or a recess recessed in a polygonal pyramid shape such as a pyramid (square pyramid) may be used.
  • the form of the 2nd low-order part was made into the same kind of form as the 1st low-order part (bottom part of the recessed part dented in the shape of a square frustum). However, it may be different from the first low-order part.
  • lattice form in the 1st high level part was illustrated.
  • a configuration may be adopted in which a plurality of first low-order parts are radially distributed and formed. Moreover, the form which formed the some 2nd low level part distributed in the grid
  • Example 1 as a formation process, the horn processing surface 132 of the horn 131 used for ultrasonic welding is made uneven
  • the process of forming the foil welded part 12C formed by molding the first high-order part 13D and the plurality of first low-order parts 13E on the first foil welded surface (scheduled joining surface) 13 is shown.
  • the first high-order portion and the plurality of first low-order portions are formed on the surfaces to be joined by pressing or the like.
  • the first high level portion 13D and the first low level portion 13E are formed on the first foil welding surface (scheduled joining surface) 13, and at the same time, the second high level portion 14D and the second high level portion 14D are formed on the second foil welding surface (electrode side surface) 14.
  • a foil welded part formed with the lower part 14E was formed.
  • the second high-order part and the plurality of second low-order parts are formed on the electrode side surface.
  • the first high-order part and the first low-order part may be formed on the planned joining surface.

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  • Chemical Kinetics & Catalysis (AREA)
  • Electrochemistry (AREA)
  • General Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Manufacturing & Machinery (AREA)
  • Materials Engineering (AREA)
  • Connection Of Batteries Or Terminals (AREA)
  • Cell Electrode Carriers And Collectors (AREA)

Abstract

La présente invention a trait à un procédé de production d'une batterie résultant de l'assemblage, au moyen d'une pluralité de noyaux de soudure entre ceux-ci, d'une section stratifiée de feuille, au niveau de laquelle des sections apparentes de feuille faisant apparaître une feuille d'aluminium se chevauchent, et d'un élément de borne cathodique comprenant de l'aluminium, lequel procédé fait appel à : une étape de formation permettant de former au niveau de la section stratifiée de feuille une section soudée de feuille au niveau de laquelle sont formées, en soudant ensemble des feuilles d'aluminium par soudage ultrasonique, une première section de position haute au niveau d'au moins une section d'une surface à assembler, et une pluralité de premières sections de position basse réparties à des points dispersés à l'intérieur de la première section de position haute ; et une étape de soudage par résistance permettant de mettre en contact la première section de position haute avec l'élément de borne cathodique, de générer des noyaux de soudure au niveau de la première section de position basse par circulation d'un courant électrique, et de souder par résistance la section soudée de feuille et l'élément de borne cathodique, les noyaux de soudure se trouvant entre ceux-ci.
PCT/JP2012/066564 2012-06-28 2012-06-28 Procédé de production de batterie et batterie WO2014002227A1 (fr)

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JP2014522305A JP5884908B2 (ja) 2012-06-28 2012-06-28 電池の製造方法
US14/410,645 US9819027B2 (en) 2012-06-28 2012-06-28 Method for producing battery and battery
DE201211006588 DE112012006588T5 (de) 2012-06-28 2012-06-28 Verfahren zur Herstellung einer Batterie und Batterie
PCT/JP2012/066564 WO2014002227A1 (fr) 2012-06-28 2012-06-28 Procédé de production de batterie et batterie
KR1020147036085A KR101746913B1 (ko) 2012-06-28 2012-06-28 전지의 제조 방법 및 전지
CN201280074329.1A CN104396050B (zh) 2012-06-28 2012-06-28 电池的制造方法以及电池

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DE112012006588T5 (de) 2015-04-02
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